American-made merino wool socks, guaranteed for life.
Hiking, running, compression and work socks knit in Fort Payne, Alabama from Responsible Wool Standard merino. Wear them out and we replace them.
- Knit in Fort Payne, AL
- RWS certified merino
- Lifetime guarantee
- Carbon-neutral shipping
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Best-selling merino wool socks
The pairs our customers reorder most.
Best seller
Best seller
Runner favorite
15 to 20 mmHg
Best seller
Best seller
Runner favorite
15 to 20 mmHgFind your pair in three questions
Tell us what you do, how much cushion you like and who they're for. We will match you to the right sock.
"12 miles of that run my feet were completely wet soaked from rain and multiple creek crossings. Not one blister or sore spot to be found."
"I just finished a 6 hour race 42 miles in them and have no complaints."
"Very lightweight, breathable, and comfortable and enough compression that I no longer have the swelling and rashes after a long day on the trail!"
"Wether I'm 5 feet down in a hole on a water main break or running trail Cloudline comes through. American made too so awesome."
"Even with it being 90°F my feet were cool and that night it was in the high 50s and my feet were plenty warm."
"Hands down nothing compares. Soft wool, absorbent, blister resistant after 50 plus miles. 90% of my drawer is cloudline."
Wear a hole in them. We'll replace them. For life.
No time limit. Holes, worn-out heels and toes, even the pair the dog got to. It covers every Cloudline sock.
How the guarantee works- 1Wear them hardHike, run, work and travel in them.
- 2Send us a quick messageYour order number, or the name and email you ordered with.
- 3Get your replacement codeThe replacement pair is free. Pay shipping, or add a few pairs and ship free over $75.
Knit in the Sock Capital of the World
Every Cloudline sock is knit in Fort Payne, Alabama, the town that earned the name Sock Capital of the World. We design and trail test them in Seattle, where coastal trails, rainforest and glacier peaks are all a day trip away.
Why merino wool socks?
Cool in heat, warm in cold
Merino adapts to your effort and the weather, so one sock works from desert miles to winter trails.
Dry feet, fewer blisters
It wicks sweat away from skin, which is why it works for sweaty feet and long days in boots.
Naturally odor resistant
No chemicals or metals added. Kick your shoes off at the end of the day with confidence.
Soft, not itchy
Fine-gauge merino yarn feels nothing like the scratchy wool socks you remember.
Merino sock questions, answered
Where are Cloudline socks made?
Every Cloudline sock is knit in Fort Payne, Alabama, USA, and designed and trail tested by our team in Seattle. Our merino wool is RWS (Responsible Wool Standard) certified.
How does the lifetime guarantee work?
Every Cloudline sock is covered for life. Send us your order number and we email a code for a free replacement pair. You only pay shipping, and shipping is free over $75.
Are merino wool socks good for hot weather?
Yes. Merino breathes and wicks sweat, so our ultralight styles are made for warm-weather hiking and running.
What size should I get?
Choose the size that matches your shoe size on our size guide. If you're right between two sizes, go with the smaller one, since Cloudline socks stretch. If you're between sizes and have wide or high-volume feet, go with the larger one.
How do I wash merino wool socks?
Turn them inside out, machine wash cold to warm, and tumble dry on low to warm heat. On the trail, hand wash and air dry.
Are merino wool socks good for sweaty feet?
Yes. Merino wool pulls sweat away from your skin and naturally resists odor, so your feet stay drier and fresher than in cotton socks. For very sweaty feet, start with our ultralight or light cushion styles, which breathe the most.